Ep 31. The Exchange Student / Crystal Ball Birthday

Alvinnn!!! and the Chipmunks season 4 episode 31 is titled "The Exchange Student / Crystal Ball Birthday." The episode is divided into two different stories.

In the first story, "The Exchange Student," we see the Chipmunks and Chipettes excited about the arrival of a new foreign exchange student named Isabelle. Alvin, being his usual self, decides to pull pranks on Isabelle, but quickly regrets it when Isabelle gets mad at him. Alvin tries to make it up to her and apologize, but she won't forgive him. He then decides to go above and beyond by setting up a surprise cultural exchange presentation for her, hoping to win her over. However, things don't go as planned and Alvin has to make a quick save to salvage the situation. Meanwhile, Simon and Jeanette bond over their love for science and realize they have a lot in common.

In the second story, "Crystal Ball Birthday," the Chipmunks and Chipettes all go to Brittany's house for her birthday party, but things take a weird turn when Brittany's aunt gives her a crystal ball as a gift. When the group starts using the crystal ball to make predictions, they start arguing with each other about what the predictions mean. Tensions rise as some predictions seem to come true while others don't. The group finally realizes that they were just reading into things too much and that the crystal ball was just a fun toy. They apologize to each other and start enjoying the rest of the birthday party.

Overall, "The Exchange Student / Crystal Ball Birthday" showcases the Chipmunks and Chipettes' relationships and how they work through their differences. It also highlights the importance of cultural understanding and communication.